Free Online Developer Tools

Fast, free, privacy-friendly tools for developers, writers, and designers. No signup, no tracking, everything runs in your browser.

Text Tools

Word Counter

Count words, characters, sentences, and paragraphs instantly.

Lorem Ipsum Generator

Generate placeholder text for design and development.

Case Converter

Convert text to uppercase, lowercase, title case, and more.

Markdown Preview

Write Markdown and see the rendered HTML output live.

Diff Checker

Compare two texts side by side and find differences.

Developer Tools

JSON Formatter

Format, beautify, and validate JSON data with syntax highlighting.

Base64 Encode/Decode

Encode text to Base64 or decode Base64 back to plain text.

URL Encode/Decode

Encode or decode URLs and query parameters.

Regex Tester

Test regular expressions against text with real-time matching.

HTML Entity Encode/Decode

Convert special characters to HTML entities and back.

Hash Generator

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text.

Number Base Converter

Convert between binary, octal, decimal, and hexadecimal.

Timestamp Converter

Convert Unix timestamps to human dates and vice versa.

Design Tools

Color Picker & Converter

Pick colors and convert between HEX, RGB, HSL formats.

Utilities

Password Generator

Generate strong random passwords with custom length and rules.

Why Use DevToolKit?

DevToolKit gives you instant access to essential developer and text tools without the bloat. Every tool runs entirely in your browser — your data never leaves your device. No accounts, no rate limits, no ads interrupting your workflow.

All Tools, One Place

Instead of bookmarking 15 different websites, DevToolKit puts everything a developer needs in one fast, clean interface. From formatting JSON and testing regex patterns to generating passwords and comparing text diffs — we've got you covered.

Built for Speed

Every tool loads instantly and processes data in real-time as you type. No waiting for server responses, no file upload limits, no processing queues. Just paste your data and get results immediately.